Definition: A mixture that is given to help stimulate the body's own immune system to produce antibodies to fight a certain disease. The mixture contains weakened or killed microbes (bacteria or viruses) or microbe parts. It is the antibodies that are created in response to the vaccine that protect against a future infection by the target disease. Vaccines can be given orally, nasally, or as an injection into the muscle or subcutaneous tissue (fat).
Also Known As: Vaccinations, shots.